March 731-1. Originally built as the first of five 721G, this chassis was updated to 731 specifications for the 1973 season. That year it was driven by Mike Beuttler, Jean-Pierre Jarier, David Purley and Reine Wisell. Chassis 731-1 eventually ended up in Sweden, where it was restored to Wisell's Swedish Grand Prix livery. In this guise, the car was raced in the 2010 Monaco Historic Grand Prix (see picture). It has since been restored back to the original 721G configuration.